Charge melting and polaron collapse in $La_{1.2}Sr_{1.8}Mn_{2}O_{7}$

Details Charge melting and polaron collapse in $La_{1.2}Sr_{1.8}Mn_{2}O_{7}$ Charge melting and polaron collapse in $La_{1.2}Sr_{1.8}Mn_{2}O_{7}$

1999-07-20

arxiv.org/abs/cond-mat/9907304v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages (RevTex), 3 postscript-formatted figures (Figs. 1 and 2 are color figures)

Scientific paper

10.1103/PhysRevLett.83.4393

X-ray and neutron scattering measurements directly demonstrate the existence of polarons in the paramagnetic phase of optimally-doped colossal magnetoresistive oxides. The polarons exhibit short-range correlations that grow with decreasing temperature, but disappear abruptly at the ferromagnetic transition because of the sudden charge delocalization. The "melting" of the charge ordering as we cool through $T_C$ occurs with the collapse of the quasi-static polaron scattering, and provides important new insights into the relation of polarons to colossal magnetoresistance.

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